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Defined Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2020

Compensation And Retirement Disclosure [Abstract]

Obligations and Funded Status

(In millions)			Pension Benefits										Postretirement Benefits
Obligations and Funded Status at December 31			2020					2019					2020					2019
Change in the Projected Benefit Obligation (PBO):
Projected benefit obligation at beginning of year			$	877.1				$	763.2				$	3.6				$	1.4
Projected benefit obligation acquired(a)				—					—					9.6					—
Service cost				0.4					0.4					0.4					0.2
Interest cost				28.3					32.9					0.2					0.2
Plan amendments				—					—					—					1.6
Actuarial loss				70.6					121.6					0.2					1.0
Benefits paid				(42.9	)				(41.0	)				(0.6	)				(0.7	)
Curtailment gain				—					—					—					(0.1	)
Projected benefit obligation at end of year			$	933.5				$	877.1				$	13.4				$	3.6
Accumulated benefit obligation at end of year    (excludes the impact of future compensation increases)			$	933.5				$	877.1				$	—				$	—
Change in Plan Assets:
Fair value of plan assets at beginning of year			$	677.2				$	599.6				$	—				$	—
Actual return on plan assets				101.3					106.8					—					—
Employer contributions				49.3					11.8					0.6					0.7
Benefits paid				(42.9	)				(41.0	)				(0.6	)				(0.7	)
Fair value of plan assets at end of year			$	784.9				$	677.2				$	—				$	—
Funded status (Fair value of plan assets less PBO)			$	(148.6	)			$	(199.9	)			$	(13.4	)			$	(3.6	)

^{(a) Related to the Larson acquisition discussed in Note 4.}

Amounts Recognized in Consolidated Balance Sheets

Amounts recognized in the consolidated balance sheets consist of:

		Pension Benefits										Postretirement Benefits
(In millions)		2020					2019					2020					2019
Current benefit payment liability		$	(1.4	)			$	(1.4	)			$	(1.1	)			$	(0.7	)
Accrued benefit liability			(147.2	)				(198.5	)				(12.3	)				(2.9	)
Net amount recognized		$	(148.6	)			$	(199.9	)			$	(13.4	)			$	(3.6	)

Amounts in Accumulated Other Comprehensive Loss that have not yet been Recognized as Components of Net Periodic Benefit Cost

The amounts in accumulated other comprehensive loss on the consolidated balance sheets that have not yet been recognized as components of net periodic benefit cost were as follows:

(In millions)		Pension Benefits					Postretirement Benefits
Net actuarial loss (gain) at December 31, 2018		$	71.8				$	(0.3	)
Recognition of actuarial loss			(34.1	)				(0.6	)
Current year actuarial loss			50.1					0.6
Net actuarial loss due to curtailment			(0.1	)				—
Net actuarial loss (gain) at December 31, 2019		$	87.7				$	(0.3	)
Recognition of actuarial loss			(2.7	)				(0.1	)
Current year actuarial loss			2.1					1.0
Net actuarial loss due to curtailment			(0.6	)				—
Net actuarial loss at December 31, 2020		$	86.5				$	0.6

Components of Net Periodic Benefit Cost for Pension and Postretirement Benefits

Components of net periodic benefit cost were as follows:

Components of Net Periodic Benefit (Income) Cost		Pension Benefits														Postretirement Benefits
(In millions)		2020					2019				2018					2020					2019				2018
Service cost		$	0.4				$	0.4			$	0.5				$	0.4				$	0.2			$	—
Interest cost			28.3					32.9				30.7					0.2					0.2				—
Expected return on plan assets			(32.8	)				(35.2	)			(41.0	)				—					—				—
Recognition of actuarial losses (gains)			2.7					34.1				3.9					0.1					0.6				(0.1	)
Settlement/Curtailment losses (gains)			0.6					0.1				—					—					(0.1	)			—
Amortization of prior service credits			—					—				—					—					0.2				—
Net periodic benefit cost (income)		$	(0.8	)			$	32.3			$	(5.9	)			$	0.7				$	1.1			$	(0.1	)

Schedule of Assumptions Used

Assumptions		Pension Benefits														Postretirement Benefits
		2020					2019				2018					2020					2019				2018
Weighted-Average Assumptions Used to    Determine Benefit Obligations at    December 31:
Discount rate			2.6	%				3.3	%			4.4	%				5.9	%				6.4	%			4.2	%
Weighted-Average Assumptions Used to    Determine Net Cost for Years Ended    December 31:
Discount rate			3.3	%				4.4	%			3.8	%				6.4	%				4.2	%			3.4	%
Expected long-term rate of return on plan    assets			4.5	%				4.9	%			6.0	%				—					—				—

Assumed Health Care Cost Trend Rates Used to Determine Benefit Obligations and Net Cost

		Postretirement Benefits
		2020				2019
Assumed Health Care Cost Trend Rates Used to Determine    Benefit Obligations and Net Cost at December 31:
Health care cost trend rate assumed for next year		6.4/7.4	%	(a)		6.7/7.8	%	(a)
Rate that the cost trend rate is assumed to decline    (the ultimate trend rate)		4.5	%			4.5	%
Year that the rate reaches the ultimate trend rate		2027				2027

(a) The pre-65 initial health care cost trend rate is shown first / followed by the post-65 rate.

Fair Value of Pension Assets by Major Category of Plan Assets

The fair value of the pension assets by major category of plan assets as of December 31, 2020 and 2019 were as follows:

(In millions)		Total as of balance sheet date
		2020				2019
Group annuity/insurance contracts (level 3)		$	24.8			$	24.2
Collective trusts:
Cash and cash equivalents			16.0				7.8
Equity			287.6				245.3
Fixed income			410.0				355.0
Multi-strategy hedge funds			24.6				23.2
Real estate			21.9				21.7
Total		$	784.9			$	677.2

Reconciliation of Level Three Measurements

A reconciliation of Level 3 measurements was as follows:

		Group annuity/ insurance contracts
(In millions)		2020					2019
January 1		$	24.2				$	23.6
Actual return on assets related to assets still held			0.6					0.6
December 31		$	24.8				$	24.2

Schedule of Expected Benefit Payments

The following retirement benefit payments are expected to be paid:

(In millions)		Pension Benefits					Postretirement Benefits
2021		$	42.0				$	1.0
2022			43.1					0.9
2023			44.2					0.9
2024			45.3					1.0
2025			46.3					1.1
Years 2026-2030			238.7					5.7

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